Fig. 9 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)

Fig. 9. Ponticeras aequabile (Beyrich, 1837). A. Cross section of specimen MB.C.30419 from the Dillenburg area. B. Suture line of lectotype MB.C.4289.1 (Beyrich 1835 Coll.) from Oberscheld (Sessacker), at dm = 31.5 mm, wh = 10.0 mm. C–F. Ontogenetic trajectories of the cardinal conch parameters. Scale bar units = 1 mm.